fix hit testing for custom elements

src/element/collision.ts

@@ -33,13 +33,20 @@ import { Point } from "../types";
 import { Drawable } from "roughjs/bin/core";
 import { AppState } from "../types";
 import { getShapeForElement } from "../renderer/renderElement";
-import { hasBoundTextElement, isImageElement } from "./typeChecks";
+import {
+  hasBoundTextElement,
+  isCustomElement,
+  isImageElement,
+} from "./typeChecks";
 import { isTextElement } from ".";
 import { isTransparent } from "../utils";
 
 const isElementDraggableFromInside = (
   element: NonDeletedExcalidrawElement,
 ): boolean => {
+  if (isCustomElement(element)) {
+    return true;
+  }
   if (element.type === "arrow") {
     return false;
   }

src/element/typeChecks.ts

@@ -10,6 +10,7 @@ import {
   ExcalidrawImageElement,
   ExcalidrawTextElementWithContainer,
   ExcalidrawTextContainer,
+  ExcalidrawCustomElement,
 } from "./types";
 
 export const isGenericElement = (
@@ -133,3 +134,7 @@ export const isBoundToContainer = (
     element !== null && isTextElement(element) && element.containerId !== null
   );
 };
+
+export const isCustomElement = (
+  element: ExcalidrawElement,
+): element is ExcalidrawCustomElement => element && element.type === "custom";